连栽杉木林生长状况的调查研究

本文通过对三明地区连栽杉木林的生长状况,地上部生物量及生产力的研究表明,林分的高和胸径生长过程以及林分的地上部生物量和生产力均随杉木连栽代数的增加而下降。连栽多代的林分其高和胸径的连年生长量迅速下降;林分的生物量和生产力一组样地:一代为72.12t/hm~2、7.82t/（hm~2·a）,二代61.01t/hm~2、6.51t/（hm~2·a）;二组一代为129.51t/hm~2、8.17t/（hm~2·a）,三代70.64t/hm~2、4.46t/（hm~2·a）。二代生产力比一代下降16.8％,三代比一代下降45.4％。

An Investigation of Artificial Chinese Fir Stands on the Repeated Plantation Woodland in Sanming,Fujian

In this paper, an investigation was made on the growth, the biomass above ground and the productivity of artificial Chinese fir stands in the rep-eated plantation woodland in Sanming, Fujian province. The results show that the growth, the biomass and the productivity of stands vary with the replanting generation times; the growth of stands H and BHD decrease rapidly with the increase of replanting generation times, with the average biomass and productivity of stands on the first group plots being 72.12t·ha-1 , 7.82t·ha-1 . yr-1 for the first generation, and 61.01t·ha-1, 6.5lt·ha-1·yr-1 for the second generation time; and on the second group plots being 129.51t·ha-1, 8.17t·ha-1· yr-1 for the first generation time, and 70.64t·ha-1, 4.46t·ha-1·yr-1 for the third generation time,where there is a significant difference(P=0.05) between the first genaertion and the second generation on the first group plots, and a great significant dif ference(P = 0.01)between the first generation and the third generation on the second group plots, indicating that the biomass and the pr-oductivity of stands decrease significantly with the increase of the cultivated times.